Circuit arrangement for stepping switches



May 17, 1932. wv KuscHE CIRCUIT ARRANGEMENT FOR STEPPING' SWITCHES Filed Au 18. 1930 Lnl 511 2? Kusche Patented May 1 7, 1932 UNITED STATES I PATENT WALTER KUSGHE, F BERLIN, GERMANY, ASSIGNOR TO SIEMENS 8a HALSKE .AKTIEN- Q GESELLSCHAFT, OF WERNERWERK, SIEMENSS'IADT, NEAR BERLIN, GERMANY CIRCUIT ARRANGEMENT FOR sTEPrING swITcHEs Application filed August 18, 1930, Serial No.

The invention relate's'to stepping switches that arepositioned by one or more impulse trains, the number of steps that can be taken 7 by these switches being smaller than the number of impulses transmitted for positioning them. I a

In the known arrangements theseswitches are positioned from the normal position by every impulse train. These have the defect 10 that the next impulse train can arrivebefore' the stepping switches havereached their nor mal position afterbeing operated by the preceding train, or that (to avoid this drawback) the setting up of the connection is'reta'rded until the stepping switches have reached their normal position after every impulse train.

Now the object' of the'invention is to remove these faults, this being achieved in that the stepping switches are moved on by every impulse train from the position reached owing to the preceding impulse train, the normal position being used like, every other position.

The figure shows one method of carrying out the invention. It shows a junction line VL' associated with aswitch W having the -wipers a1, 61, 01, d1, 61, f1; the switch can be used for the most diverse purposes, for example, it can serve .to designate different 0 trafiic routes and also as a selecting'device for selecting free trunk lines in one or more trafiic directions.

As a device for designating different traflic routes it can also form the switch, which-- after a group selector GW positioned over the junction line has been released andjafter the switching-over to another traflic route has been effected-is reached over the latter route and comprises the same switching device that served to designate the traific route. After designating has been eiiected, its positioning can be effected by means of anon-numerical selection like a preselector or it can be done by means of number impulses like a posterior switch. V The details of the circuit will now be described so far as they are of interest.

When the junction line VL is reachedby some connecting device, over the a lead a circuit is established, in which the winding 1 moved on two steps.

475,890, and in Germany October so, 1929. V

II of relay C isplaced in a locking circuitover: earth, battery, contact 3 0, winding II a of relay C,.contact 5 a, relay V 1, earth. In

this circuit relay V 1 is also energized, By operating his number dial, the subscriber can repeatedly interrupt the line loop, in which the feeding bridge relays A and Bwere ener- 'gized, and so can,'in.known manner, position the group selector GW associated with the junction line VL. After the group selector'GW has been positioned, other connecting. devices beyond the group selector can be positioned by means. ofnumber impulses from the calling subscriber, because the interruptions of the line loop are repeated over the junction line VL by the closing of contact 50 a at each impulse.

Besides acting on the difierent connecting devices,'the current impulses transmitted by the subscriber at the same time act on the switch W. If the first impulse train consists V of two impulses, the first time relay A is deenergized, the relay V 2 is energized over: earth, battery, contact 3 0, contact 4 a, windmg I of. relay V 2, "relay V 1, earth; because short circuit. Relay V 2 remains energized during the whole impulse train, because the short circuit at each impulse has caused it to work as a slow acting relay, similarly as the relay G, which, during the impulse train, does not fall back owing to the short circuit at contact, 4 a. At every impulse the rotary magnet'D of the switch W is energized at the same time as the driving magnets ofthe dif contactf5 a has momentarily removed the ferent connecting devices over earth, battery,

rotary magnet D, contacts 44 4; 2,43 7", 42 a earth. Hence, the wipers of the switch W are Hence, after relay V 2 has been released owing to being short circuited over its winding I by contact 5 a. at

the end of the impulse train, the following circuit is established over the wiper d1: earth, contacts 28 c, 24 o 2, 25 a, wiper 6Z1, contacts n 1, 6 h 1, relay H 1, battery, earth,

Relay H 1 is operated in thiscircuit and by closing its contacts 7 hi it places itself in a locking circuit over: earth, contacts 12 0, 7 h 1, relay H 1, battery, earth. Contact 18 h 1 closes a circuit for energizing the relay U over: earth, battery, resistance VVi, relay U, contact 18 72, 1, earth. Hence, contact 25 u is opened and contact 26 u is closed.

If the neXt impulse train comprises one impulse, the rotary magnet D of the switch IV advances the wipers one step. Hence, the wiper e 1 reaches the contact 9?. 2, and upon the release of relay V 2 at the end of the impulse train the following circuit is closed:

earth, contacts 23 c, 24 'v 2, 26 a, wiper e 1 of the switch W, contacts 11. 2, 31 h 2, relay H 2, battery, earth. The closing of contact 32 h 2places the relay H 2 in a locking circuit over: earth, contacts 27 0, 32 h 2, relay H 2, battery, earth. Furthermore, contact 16 72. 2 short circuits relay U, which is released, and after contact 26 u has been opened the contact 25 u is closed. 7

The third impulse train consisting of three impulses advances the switch W three steps. so that the wiper d 1 reaches the contact n 3, over which the following circuit is established .after relay V. 2 has fallen back at the end of the impulse train: earth, contacts 23 c, 24 o 2, 25 u, wiper cl 1 of the switch W, contacts n 3, 30 h 1, 29 h 3, relay H 3, battery, earth. By closing its contact 28 72. 3, the relay H 3' places itself in a locking circuit over: earth, battery, relay H 3 contacts 28 h 3, 27 a, earth. Relay U. now is again energized, because contact 17 h 3 removes the short circuit from its winding; contact 25 u is opened and contact 26 u is closed.

The fourthimpulse train consisting of one impulse advances the switch W so that its wiper e 1 reaches contact 11. 4, at the endof the impulse train the following circuit is established: earth, contacts 23 c, 24 o 2, 26 u, Wiper e 1 of switch W, contacts n 4, 35 h 2, 33 h 4, relay H 4, battery, earth. The closing of contact 34 h 4 locks the relay H 4 over: earth, contacts 27 c, 34 h 4, relay H 4, battery, earth, The closing of contact 19 h 4 short circuits the relay U, hence, it is released and closes contact 25 u after opening contact 26 u.

If the next impulse train consists of two impulses, the wiper d 1 of the switch W reaches the contact a 5, that is to say, its normal position. Therefore the following circuit is closed after the impulse train has ended: earth, contacts 23 0, 24 o 2, 25 u, wiper '(Z 1 of the switch W, contacts a 5, 11 h 3, 9 h 5,

relay H 5, battery, earth, By closing contact 10 h 5, relay H 5 closes a locking circuit for itself, while the opening of contact 20 h 5 removes the short circuit from the winding of relay U, and thus this relay is again ener gized. Hence, contact 25 u is again opened and contact 26 it is closed.

During the next impulse train, which is assumed to consist of eight impulses, the switch W is movedon eight steps, so that the wiper e 1 reaches the contact n 6, over which the following circuit is established at the end of the impulse train: earth, contacts 23 c, 24 o 2, 25 u, wiper e 1 of switch W, contacts 02 6, 38 h 4, 36 h 6, relay H 6, battery, earth. In this circuit relay H 6 is energized, and by closing its contact 37 h 6, it places itself in a locking circuit over: earth, contacts 27 c, 37 h 6, relay H 6, battery, earth. Relay U is shortcircuited by the closing of contact 21 h 6, hence, it falls back and after having opened its contact 26 u it closes the contact 25 u. Furthermore, after relay H 6 has been energized, the following circuit is established: earth, winding II of relay V 2, contact segment, wiper 1 of the switch IV, contacts 40 h 6, 41 m, relay Y, battery, earth. Relays V 2 and Y are operated in this circuit, hence, the rotary magnet D of switch W is placed in an automatically operated energizing circuit: earth, battery, rotary magnet D of switch W, contacts 44 'v 2, 46 11 relay interrupter RU, earth. The rotary magnet continues to be operated until the wipers of the switch .W have reached their normal position, that is to say, at the moment when the wiper f 1 leaves the contact segment the circuit of the relays V 2 and Y is opened, so that the switch is arrested. In the now reached zero position the following circuit is established: earth, contacts 23 c, 24 o 2, 25 u, wiper d1 of the switch W', zero position contact 4L5), contacts 15 h 6, 14 m, relay X, battery, earth. The relay X is operated in this circuit and by closing its contact 13 m it is placed in a locking circuit over: earth, contacts 12 c, 13 m, relay X, battery, earth.

On being operated, the relay X also opens the contacts 54 w, 58 w, and 60 00, whereby the positioned group selector G W and the succeeding positionedconnecting devices are released in some manner, and the junction line VL over the contacts 56 w, 57 w, 59 w is switched onto the wipers a 1, b 1, c1 of the switch W. One possibility now is that the switch hunts for a connecting device of another traffic route, for example, by closing the contact 47 a? the relay X establishes an automatic energizing circuit for the rotary magnet D, which is kept dependent on the a test relay T of the switch W. When a free connecting device is. reached the relay T is operated over the wiper c 1 and at contact 48 tit opensthe energizing circuit of the rotary magnet D. In an alternative arrangement the contacts 47 m and 48 t are omitted and the switch W is positioned by number impulses like a posterior switch, since the further impulse trains transmitted by the subscriber cause the energizing circuit of the relays A and B to-be interrupted at each impulse in the same manner, hence, the number impulses reach the rotary magnet D of the switch IV over the contact 42 a after contact 44 o 2 has been closed.

and

We see from the description that the switch W, which is positioned by a number of impulses for designating a trafiic route or some other purpose, the number of such impulses being greater than thenumber of its steps; this switch can be used also for other purposes, for example, asapreselector-or as a posterior selector.

What is claimed is;

1. In a telephone system, a stepping switch, means for positioning said switch by one or more impulse trains, said switch having a smaller number of steps than the number of impulses transmitted for positioning it, and means for advancingjsaid switch by every impulse train from the position reached owing to the preceding impulse train. I f

2. In a telephone system, a'stepping switch, means for positioning said switch by one or more impulse trains, said switch having a smaller number of steps than the numberyof impulses transmitted for positioning it, means foradvancing said switch by everyimpulse train from the position reached owing to the preceding impulse train, and means effective at the conclusionof every impulse train that effects the positioning of said switch for determining the manner in which said switch will continue to operate.

3. In a telephone system, a trunk havingaccess to automatic switches over two branches, means for transmitting trains of impulses for positioning certain of said automatic switches over one of said branches, a rotary stepping switch associated with said trunk adapted to be advanced by every impulse train from the position reached owing to the preceding impulse train, and means controlled by the impulse trains that serve to position said automatic switches over one branch forpositioning said stepping switch to determine over which particular branch the connection is to be established. f

4. In a telephone system, a trunkrhaving access to automatic switches over two branches, means for transmitting trains of impulses for positioning certain of said antomatic switches over one of said branches. a single level stepping switch associated with said trunk adapted to be advanced by every impulse train from the position reached owing to the precedingimpulse train. means controlled by'the impulse trains that serve to position said automatic switches over one branch for positioning said stepping switch to determine over which particular branch the connection is to be established, and means including said switch for connecting up automatic switches over said other branch.

5. In a telephonesystenna trunk having access to automatic switches over different branches, a rotarystepping'switch associated with said trunk adapted to be advanced by each impulse of every impulse train from the position reached owing to the precedingimpulse. train, said switch being positioned by the same impulse trains that serve to position automatic switches over one of said.

said automatic switches over one branch for positioning said stepping switch to determine over which particular branch the connection is to be established, means for returning said switch to normal after the particular branch'has been determined, and means including said switch for completing a connection over said other branch.

' 7. Ina telephone system, a trunk having a plurality of branches, means for transmitting a plurality of series of impulses over said trunk and oneof said branches to extend a connection, a single level stepping switch as sociated with said trunk adapted to be advancedby each impulse of every impulse train from the position reached owing to the preceding impulse train, and means responsive to a particular plurality of series of impulses for releasing the connection over said one branch and for operating said switch to extend a connection over the other of said branches.

8. In a telephone system, a trunk line having a plurality of branches, a stepping switch terminating each of said branches, means for directively operating the switches over said trunk, means controlled by one of said switches for determining the particular branch over which the connection is to be completed, said one switch being adapted to be advanced by every impulse train from the position reached owing to the preceding impulse train. and 'means responsive when the connection is to be completed over the branch terminating in said one switch for releasing the connection over the other of saidbranches and for operating the switch to extend the connections I 9. In a telephone system, a trunk line having access to automatic switches ina main exchange and a branch exchange, means for transmitting a plurality of series of impulses over said trunk line for positioning switches in said main exchange, a stepping switch having a plurality of wipers, a plurality of registering relays, means responsive to a particular pluralityof series of impulses for operating said relays over certain of said wipers, and means responsive to the. operation of all of said relays for establishing a connection over the remaining wipers with an automatic switch in said branch exchange. 10. In a telephone system, a trunk line extending to a selector switch, means for sending a plurality of series of impulses over said trunk line to operate said selector and succeeding selectors, a branch of said trunk line,

a combination register and selector switch responsive to said series of impulses, said combination switch having registering wipers and a set of selector wipers terminating said branch, relays successively operated over said register wipers responsive to particular series of impulses, and means controlled by the last operated one of said relays for disconnecting the trunk line from said selector and for connecting the trunk to said branch.

11. In a telephone system, a trunk line eX- tending to a selector switch, means for send ing a plurality of series of impulses over said trunk line to operate said selector and succeeding selectors, a branch of said trunk line, a combination register and selector switch responsive to said series of impulses, said combination switch having registering wipers and a. set of selector wipers terminating said branch, relays successively operated over said register wipers responsive to particular series of impulses, means controlled by the lastoperated one of said relays for disconnecting the trunk line from said selector and for connecting the trunk to said branch, and means for restoring said combination switch to normal.

12. In a telephone system, a trunk line extending to a selector switch, means for sending a plurality of series of impulses over said trunk line to operate said selector and succeeding selectors, a branch ofsaid trunk line, a combination register and selector switch responsive to said series of impulses, said combination switch having registering wipers and a set of selector wipers terminating said branch, relays successively operated over said register wipers responsive to particular series of impulses, means controlled by 'the last operated one of said relays for disconnecting the trunk line from said selector and for connecting the trunk to said branch, means for restoring said combination switch to normal, trunk lines accessible to said set of selector wipers, and means for causing said combination switch to hunt for an idle one of said trunk lines.

13. In a telephone system, a trunk line, means including a selector switch for extending said trunk line responsive to a series of impulses, a branch of said trunk line terminating in a lineswitch having a rotary movement only, means for operating said lineswitch responsive to said series of impulses, trunk lines accessible to said lineswitch, a registering device comprising relays for causing said lineswitch to hunt for an idle one of said trunk lines, and wipers on said lineswitch for operating said relays.

14. In a telephone system, a trunk having access to automatic switches over two branches, means for transmitting series of impulses for positioning certain of said automatic switches over one of said branches, a register responsive to said series of impulses, relays successively operated by said register responsive to a predetermined number of impulses in eachof a predetermined number of said series ofimpulses, each 0]": said relays preparing a circuit for the succeeding relay, and means responsive to the operation of the last one of said relays for disconnecting said trunk from the first one of said branches and for connecting said trunk to the automatic switches over the other of said branches.

15. In an automatic telephone system, a stepping switch, means for positioning said switch by each impulse of one or more series of impulses, said switch having a smaller number of steps than the number of impulses transmitted for positioning it, means for advancing said switch by each impulse of every impulse series from the position reached responsive to the preceding series of impulses, and means responsive to a predetermined number of impulses in each series and a predetermined number of series of impulses for restoring said switch to normal.

16. In an automatic telephone system, a stepping switch, means for positioning said switch by each impulse of one or more series of impulses, said switch having a smaller 'number of steps than the number of impulses transmitted for positioning it, means for advancing said switch by each impulse of every impulse series from the position reached responsive to the preceding series of impulses, means responsive to a predetermined number of impulses in each series and a predetermined number of series of impulses for restoring said switch to normal, and means for subsequently causing said switch to automatically advance step by step.

17 In a telephone system, a trunk line, means including a selector switch for extending said trunk line responsive to series of impulses, a branch of said trunk line terminating in a second switch, means for positioning said second switch by each impulse, in said series of impulses from the position reached responsive to the preceding series of impulses, trunk lines accessible to said second switch, and means responsive to a predetermined number of series of impulses and a predetermined number of impulses in each of said series for restoring said second switch to normal, disconnecting said trunk line from said selector switch, and for connecting said trunk line to said branch.

18. In a telephone system, a trunk line,

means including a selector switch for extending said trunk line responsive to series of impulses, a branch of said trunk line terminating in a second switch, means for positioning said second switch by each impulse in said series of impulses from the position reached responsive to the preceding series of impulses, trunk lines accessible to said second switch, means responsive to a predetermined number of series of impulses and a predetermined number ofimpulses in each of said series for restoring said second switch to normal,

disconnecting said trunk line from said selector switch, and for connecting said trunk line to said branch, and means for subsequently advancing said second switch automatically to find an idle one of said trunk lines accessible to said second switch.

19. In an automatic telephone system, a

trunk having two branches, means responsive to a plurality of series of impulses transmitted by a calling subscriber for operating a train of automatic switches over the first of'said branches, a rotary stepping switch associated with said trunk positioned by each impulse of said plurality of series of impulses from the oil-normal position reached responsive to the preceding series of impulses, and 7 means responslve to a predetermlned number of impulses being dialled in each of said series of impulses for releasing the switches over said first branch and for seizing the second of said branches.

20.- In an automatic telephone system, a trunk line having access to automatic switches over two branches, means for transmitting a plurality of series of impulses over said trunk linefor positioning automatic switches over a one of said branches, a stepping switch hav-' ing two wipers and associated banks, relays connected to said banks, means re'sponsiveto sald series of impulses Vfor alternately operating relays connected to each of said banks, each of said relays preparing the circuit for the succeeding relay, and means responsive to the operation of the last relay for restoring said stepping switch to normal and for connecting said trunk to said automatic switches over said second branch. 7

In witness whereof, I hereunto subscribe my name this 22nd day of July, A. D. 1930. I

' WALTER KUSCHE. 

